Current theorists assume that people are unable to coordinate strategies, but Medina suggests this is an implausible proposition. He provides an analysis of what happens if we account for the fact that group members may communicate expectations to each other. work of considerable theoretical and methodological complexity, A Unified Theory of Collective Action and Social Change seeks to show how individuals gauge the value of their participation in a given endeavor, and how they calibrate their decisions with those of other group members.